looks very good.
the PSU is massive overkill, a vx550 would suffice and still have plenty of headroom.
i personally wouldn;t get a 'green' HDD. but thats a perosnal choice, i'd want more performance. are you specifically looking for a green drive?
what are you planning on doing with this rig? I'm wondering if the 9400gt is a good choice. obviously its not going to game well, but if you are in it for productivity a 5 series card from ATI may be a better choice (offering 3 monitors form a single card if you ever need it)